Income Taxes Income Taxes (Reconciliation Statutory Income Tax Rates) (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(1.60%)	(2.50%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	2.20%	2.10%
Effective Income Tax Rate Reconciliation, Low-Income Housing and Rehabilitation, Percent	(0.30%)	(0.80%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.80%	1.10%
Effective Income Tax Rate Reconciliation, Percent	22.10%	20.90%